In my opinion, you have enough grease in the pin. Loader movement will spread it around.
Having said that, when I identify one or two pins grease resistant, I reposition the loader in lift and tilt, then reapply the grease gun coupler and pump in a bit more to the resistant pins.
Infrequently, I put the bucket on the ground with just a little down pressure, which reverses weight distribution on pins relative to bucket in the air, and encourages grease to enter the stubborn pins.
Pins that do not want to take grease one time, may accept grease normally on the next greasing occasion.
My FEL manual calls for greasing every ten hours of use. As new grease is soft, but grease exposed to air gradually congeals, then hardens, the best way to prevent plugged Zerks is to grease regularly, with the new grease pushing out the old. Under perfect circumstances old, dirty grease will be wiped off the pin trunnions with a paper towels and a weak solvent.
WD-40 and Simple Green, are both convenient solvents for removing old, dry, dirty grease with paper towels.
A Lock & Lube grease gun coupler is a worthwhile investment. I use a full size, manual Lincoln grease gun taking standard molly grease cartridges, with a coupler.